developerWorks: Build Code with lex and yacc, Part 1: Introduction

"Most people never need to know what lex and yacc do. You occasionally need to have them installed to compile something you downloaded, but for the most part, it just works. Maybe an occasional README file refers to 'shift/reduce' conflicts. However, these tools remain a valuable part of the Unix toolbox, and a bit of familiarity with them will go a long way.

"In fact, while lex and yacc are almost always mentioned in the same breath, they can be used separately. A number of very entertaining if trivial programs have been written entirely in lex. Programs using yacc, but not lex, are rarer..."

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